FeCrMoCBM(M=Gd, Tb)大块非晶合金的制备及热稳定性、力学性能研究
Preparation of FeCrMoCBM(M=Gd, Tb) Bulk Amorphous Alloys and Research on Its Thermal Stabilities and Mechanical Properties
陶平均1, 杨元政1, 毛 杰1, 白晓军2
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作者单位：1. 广东工业大学 材料与能源学院, 广东 广州 510006; 2. 深圳大学 材料科学与工程学院, 广东 深圳 518060)
中文关键字：大块非晶合金； 稀土元素； 玻璃形成能力； 显微硬度； 脆性断裂
英文关键字：bulk amorphous alloys; rare earth element; glass-forming ability; microhardness; brittle fracture
中文摘要：采用铜模真空吸铸法制备出系列不同直径的Fe48Cr15Mo14C15B6M2(M=Gd，Tb)非晶合金棒，借助X射线衍射仪、示差扫描量热仪、显微硬度仪及万能试验机，对其玻璃形成能力、热稳定性、显微硬度和室温单轴压缩性能进行研究。结果表明，Fe48Cr15Mo14C15B6M2(M=Gd，Tb)合金具有较大的玻璃形成能力，非晶合金的最大尺寸达10 mm及以上；非晶合金的晶化过程为多级晶化行为，M=Tb时，其具有更好的热稳定性；非晶合金的显微硬度随直径增大而减小，相同尺寸含Tb非晶合金的显微硬度高于含Gd非晶合金；压缩断裂前应力-应变曲线具有较好的线性关系，M=Tb时非晶合金的应变量比M=Gd时的大，断裂方式为典型的脆性断裂。
英文摘要：The series of Fe48Cr15Mo14C15B6M2(M=Gd, Tb) amorphous alloy rods with different diameters were prepared using the copper mold suction casting. The glass forming ability, thermal stability, microhardness and room-temperature uniaxial compression properties were studied by X-ray diffraction, differential scanning calorimeter, microhardness tester and universal testing machine. The results show that Fe48Cr15Mo14C15B6M2(M=Gd, Tb) alloys have the larger glass-forming ability, the maximum diameter of the amorphous alloy rods with 10 mm or more can be obtained. The amorphous alloys' crystallization process exhibits multi-stage crystallization behavior, meanwhile when M=Tb they have the better thermal stability. With the increase of diameter, the microhardness gradually drops, while the microhardness of the amorphous alloys with Tb is larger than that of the ones with Gb at the same diameter. Under compression, the amorphous alloys show plastic deformation, and the fracture mode is a typical brittle fracture.